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I tried to veg with HPS for about a week or two. NOT RECOMMEDED! My plants started acting funny, leaves twisting, un-even growth, and purpling of stems. Once I put my MH back in, it started to look normal. If you have the proper vent, go for the 400MH for Veg. My 250MH ran ALOT cooler than 400HPS.

I have simular demensions for my grow. 4' Width x 2' Depth x 8' Height. On open loop system. I'm using a 400HPS, I HAD to buy a air cooled reflector. I also HAD to buy a 177CFM vortex 4" to exhaust hot air. I have another one on a speed controller to bring in cool air from outside. My room is at...